Allow Admins to Set Notifications for Groups and Channels
Currently, it up to users to turn on notifications for new posts in channels. This should be up to the admin/channel owners as these are sometimes used for business operation notifications and we can't rely on every user to actually turn on notifications for a channel. In fact, there is far too much left up to the user that a Teams Admin should have the ability to setup as an organizational policy.
I can't say yes to this enough.
I second this. We spend a lot of time educating our users that notifications are unfortunately off by default, and then explaining to them how to turn them on.
There should be options per Channel and Team to have notifications enabled/disabled by default, with options to allow/disallow users to change notification settings per Channel/Team.